some websites on Vauquois

German Deserter's War Experience, translated by J. Koettegn, New York 1917. See Chapter 21 "In the Hell of Vauquois"

Verdun 1916 (pdf) includes a description of the mine warfare at Vauquois, which "was regarded by the French as the worst posting at Verdun, and Verdun was regarded as the worst on the Western Front. Life at Vauquois was so bad that during late 1917 a short-lived and unofficial truce was declared between the two bitter enemies. The fighting had become unbearable, and in the end, the Germans tried to destroy the entire hill; a task that proved simply too great."